MIL - Check engine light issue

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Dec 16, 2010 | 10:44 AM

brianjw4

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MIL - Check engine light issue

I can't seem to get the check engine light to work. I've got an led with the positive side wired to ignition and the negative side to the brown/white wire. The pcm is throwing a MIL circuit code. It's a 2000 f-body engine / harness.

Has anyone had this issue before? Maybe I'm missing something.

Dec 16, 2010 | 10:54 AM

TomM

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From: Baytown, Texas

Do you have the polarity on the LED correct, they only work one way.....check the LED and see if it's good, on a know power source...battery etc..

T,

Dec 16, 2010 | 11:08 AM

brianjw4

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Yeah, I tested the light. Works fine with when grounding to the chassis and using ignition +.

Dec 16, 2010 | 02:24 PM

gofastwclass

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From: KCMO

An LED doesn't draw enough current to work properly. You need to use a regular lamp or a resistor with the LED. Since I'm at work I can't tell you what size resistor you will need but I think I have a link saved at home with all kinds of goofy info like that.

Dec 16, 2010 | 02:29 PM

brianjw4

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hmmm, did put a resistor on the led. Will have to try hooking up a regular bulb to the pcm ground and see if it works.

Dec 16, 2010 | 02:37 PM

brianjw4

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found the problem - previous owner of the harness cut the wire at the pcm - fixed and it works now. Funny, the harness was advertised as with "no cuts" and it had this and the egr pigtail cut off.

thanks for the help guys

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